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Question

Difficulty: MediumMountain Driving and Steep Grades

While descending a mountain road, a driver observes a yellow diamond-shaped warning sign indicating a steep downhill grade ahead. To prevent brake overheating (brake fade) and safely maintain control on the decline, which driving technique should be used?

  1. A
    Maintain continuous, light pressure on the brake pedal throughout the descent to hold a constant speed
  2. Shift into a lower gear prior to the descent and use engine braking, applying the brakes intermittently to snub speed when neededAnswer
  3. C
    Treat the yellow diamond sign as a mandatory stop regulatory requirement and bring the vehicle to a full stop on the incline
  4. D
    Accelerate slightly before the descent to clear traffic quickly, relying on sudden hard braking only if an obstacle appears

Answer

Shift into a lower gear prior to the descent and use engine braking, applying the brakes intermittently to snub speed when needed.
Downshifting to a lower transmission gear before descending a steep grade uses engine compression to control speed automatically. Combining engine braking with short, intermittent brake applications keeps brake components cool and prevents brake fade.

Step-by-Step Solution

1
Identify the primary hazard of long steep downhill grades
Recognize that sustained vehicle weight and momentum push the vehicle downhill, causing rapid acceleration.
Understanding downhill dynamics highlights why standard wheel braking alone is insufficient.
2
Select the correct speed control control method
Downshift transmission to a lower gear before starting down the incline to engage engine braking.
Engine braking uses internal engine resistance to control vehicle momentum without generating brake pad friction.
3
Execute proper brake pedal technique
Apply brakes briefly and firmly only when speed exceeds safe limits, then release to let components cool.
Intermittent braking (snubbing) prevents thermal overload and brake fade.

Key Concept

Engine braking and brake fade prevention on steep mountain descents
Estimated Time:1m 0s
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Topics

Mountain Driving and Steep Grades

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